body {
  background-image: url(../img/bg1.jpg);
  background-size: cover; }

#card_game #index_menu_show {
  height: 81vh;
  width: 60vw;
  background-color: rgba(11, 11, 11, 0.3);
  margin-left: 20vw; }
  #card_game #index_menu_show .Lv {
    width: 60vw;
    margin-top: 2vh; }
    #card_game #index_menu_show .Lv button {
      width: 15vw;
      height: 7vh;
      line-height: 4vh;
      margin-left: 50%;
      -webkit-transform: translateX(-50%);
              transform: translateX(-50%);
      font-size: 30px; }
  #card_game #index_menu_show .switchLv {
    width: 60vw;
    text-align: center;
    font-size: 50px;
    color: white;
    margin-top: 10vh;
    padding-top: 3vh; }
